The deal brings together CBS television network, CBS News, Showtime cable networks with MTV Networks, Nickelodeon, Comedy Central and the Paramount movie studios. Together, the company will own more than 140,000 TV episodes and more than 3,600 film titles.

The new company, ViacomCBS, will compete in an industry that has been reshaped after large-scale deals, including $85 billion purchase of Time Warner by AT&T (T.N) and Walt Disney’s (DIS.N) buyout of Twenty-First Century Fox Inc’s film and television assets.

Here is a list of six major media companies, their CEOs and the assets they own: